<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
	var stringValue='hello world';
	//console.log(stringValue.slice(3));//loworld
	//console.log(stringValue.substring(3));//loworld
	//console.log(stringValue.substr(3));//loworld
	
	//console.log(stringValue.slice(3, 7));//lo w
	//console.log(stringValue.substring(3, 7));//lo w
	//console.log(stringValue.substr(3, 7));//lo worl
	
	console.log(stringValue.slice(-7,-3));//o wo
	console.log(stringValue.slice(4,8));//o wo
	
	console.log(stringValue.substring(-7,-3));
	console.log(stringValue.substring(0,0));
	
	console.log(stringValue.substr(-7,-3));
	console.log(stringValue.substr(4,0));
	
	console.log(stringValue.substring(3,0));
	console.log(stringValue.substring(0,3));
	
	console.log(stringValue.substr(3,-4));
</script>
</head>

<body>
</body>
</html>
 